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Synlett 2010(5): 769-773
DOI: 10.1055/s-0029-1219359
DOI: 10.1055/s-0029-1219359
LETTER
© Georg Thieme Verlag
Stuttgart ˙ New York
Guanidine Bases in Synthesis: Extending the Scope of the Corey-Chaykovsky Epoxidation
Further Information
Received
30 October 2009
Publication Date:
17 February 2010 (online)
Publication History
Publication Date:
17 February 2010 (online)
Abstract
Guanidine bases, such as 1,5,7-triazabicyclo[4.4.0]dec-1-ene (TBD) or 7-methyl-1,5,7-triazabicyclo[4.4.0]dec-1-ene (MTBD), are highly effective reagents for the in situ generation of sulfonium ylides from sulfonium salts in Corey-Chaykovsky epoxidation reactions of aldehydes. These reactions proceed rapidly to produce the corresponding epoxides in excellent yields and with high selectivity for the trans product. Significantly, this reagent combination is applicable to both nonenolizable and enolizable aldehydes and α,β-unsaturated aldehydes.
Key words
guanidine bases - in situ ylide generation - Corey-Chaykovsky epoxidation - epoxides - enolizable aldehydes
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